Sash pulley



DCC. 5, 1933. E' w NORTH 1,937,776

SASH PULLEY 2 Sheets-Sheet 1 Filed May 5l, 1950 Mw@ www@ Dec. 5, 1933. E. w. NORTH SASH PULLEY Filed may s1, 195o 2 Sheets-Sheet 2 jkl/67534074.'

Patented Dec. 5, 1933 7 sAsH PULLEY77 7 Edwin W. North, Rockford, Ill., assgnor to National Locki Co., Rockford, Ill.,

\ `tion of Delaware Application May 31, 1930.7 serial No. 458.5372 `4 claims. (C116-212) 7 This invention relates tocthe construction and method of making sash pulleys andto a pulley that is particularly well adapted to be used in a relatively vthin sash frame;

Y It is an'object of this invention toprovide a pulley of `this nature .which may be manufactured economically inv large quantities and which is strong and durable. 1 7 7.

7 7 In accordance withthis invention the complete pulley housing is made of two sheet metal parts,

one the casing, preferably formed of one .piece of sheet metal secured to the second, a face plate,

formed from a second piece of sheet metal. It

is also preferred to use an all metal pulley wheel within the metal housing although any type of pulley wheel may be used satisfactorily within the housing. l

A better understanding will be had of my invention from the following description given in connection with the drawings in which: n

Fig. 1 is a side elevation of a sash pulley constructed in accordance with this invention.

Fig. 2 is an end elevation of the pulley shown in Fig. 1 looking at the right hand end thereof.

Fig. 3 is a vertical section on line 3-3 of Fig. l.

Fig. 4 is a section on line 4 4 of Fig. 1.

Fig. 5 is a section on line 5.-5 of Fig. 1.

Fig.` 6 is a plan view of a single blank from which the pulley casing is formed.

Fig. 7 is a plan view of the blank after one or more operations has been performed thereon.

Fig. 8 is a plan view during anotherrstage of its formation.

Fig. 9 is a section on line 9-9 of Fig. 8.

Fig. 10 is a bottom plan'view of the blank shown in Fig. 8.

Fig. 11 is an end elevation.

Fig. 12 is an end elevation looking into the casing after the blank has been formed.

Fig. 13 is a plan view of a blank partially formed comprising the face plate.

Fig. 14 is a plan View of the face plate completely formed, and

Fig. 15 is a section on line 15-15 of Fig. 14.

Fig. 16 is plan view of the strip from which the blanks shown in Fig. 6 are formed.

Referring to the drawings, the pulley housing can best be described by `considering the steps involved in the method of manufacture thereof. 50 The complete housing comprises two members,

one a casing for substantially inclosing the pulley wheel and the other aface plate for completing the enclosure and for securing the complete housing to the sash or other element to which the housing is attached.

The casing member is formedfrom a single blank latshown in Fig. 6 which is first cut from a strip lshown in Fig. 16, the circular cut out portions being utilized for the sides of the pulf ley wheel; The blank la 'is then stamped `by GQ suitable dies to bend` the4 edge portions into fianges `2 and 3 extending at right angles from theibody of the7blank and toform the center portion 4 thereof to provide `the two halves of the casing as shown in Fig. 7. The blank is then Vfurther formed by punching and Ytrimming to M' the form. shown in Figs. 8, A9 andlO. At this stage thelblank is in substantially complete form ready for folding. The center portion thereof is shaped to form the two halves 6 and 7 apertured asV at 8 and 9 joined by the center portion 4 and terminating in the two flanges 2 and 3. The two halves are substantially bounded by slight beads or flanges 11 and 12.

The blank is also formed with a pair of ears `7 13 along one edge of the center portion 4 for purposes later to be described.

The blank is then bent or folded along the center portion 4 thereof to bring the two halves 6 and 7 together to provide a pulley chamber 'SQ therebetween with the flanges 2 and 3 opposing Veach other and lying in the same plane to form a continuous iiat surface as shown more particularly in Fig. 12.` When so formed the flanges 11 and 12 will abut each other thus providing g5 a strengthening rib `around the periphery of the casing. Preceding or following the folding operation the anges 2 and 3 may be trimmed to final shape as shown in Fig. 12.

Immediately after or during the folding op- ,-99 eration the center portion may be provided with a depressed rib 14 (Fig. 1) which serves to keep the cord which passes over the pulley from contacting with the raw edge of the center portion 4, which, when the blank is fully formed, con- 9'5 stitutes one outlet for the7 cord passing over `the pulley. The prongs or ears 13 are'also bent inwardly to form rope guides as shown in Fig. 1 to guide the rope outwardly when it is being threaded over the pulley. 100

The face plate is also stamped from a single blank as shown in Figs. 13, 14, and 15. Fig. 13 shows the first operation at which operation the blank 15 is punched to provide a center depression 16. Upon further operation the blank is .105 stamped to provide a marginal flange 18 bent at right angles to the main body of the blank. The depression 16 is also apertured as at 19 and provided with a struck-in bead 20. The aperture 19 will permit passage of the cord which passesmgll over the pulley Whereas the bead 20 will prevent the cord or rope from coming into contact with the raw edge of the metal surrounding the aperture. The casing and face plate may be provided with apertures to receive securing screws.

When assembled a suitable pulley such as a sheet metal pulley 21 is inserted in the casing and secured therein by a pivot pin 22. The face plate is then placed over the flanges 2 and 3 with the depression 16 projecting outwardly. The marginal flange 18 is then crimped about the outer periphery of the flanges 2 and 3 thus holding the casing together without the use of prongs or tongues.

It follows from the above that there has been provided a sheet metal pulley housing composed of a casing member formed from a single sheet and which substantially surrounds the pulley when assembled and a face plate formed from a second blank and secured thereto without the use of struck-up prongs engaging apertures in the casing member. The pulley housing may be economically manufactured in great quantities and when assembled occupies a minimum space without sacrificing strength and rigidity.

It is obvious that minor changes may be made in the details of construction without departing in the spirit and scope of this invention as dened in the claims appended hereto.

I claim:

1. A sash pulley housing comprising a casing, said casing being formed Afrom a single sheet of metal shaped and bent along a line intermediate its ends to provide a recess for receiving and substantially inclosing a pulley, said e'nds terminating in a pair of anges lying in the same plane, said casing having an opening provided therein for permitting the passage of a cord, and a face plate formed from a second sheet of metal and secured to said flanges, said face plate having an opening therethrough for permitting the passage of a cord.

2. A sash pulley housing comprising a casing lformed from a single sheet of metal having two opposed circular portions connected by an integral relatively narrow strip of metal, said circular portions terminating in a pair of abutting flanges lying in the same plane, and a face plate secured tov said pair of flanges.

3. A sash pulley housing comprising a casing formed from a single sheet of metal having two opposed circular portions connected by an integral relatively narrow strip of metal, said circular portions terminating in a pair of abutting flanges lying in the same plane, and means for securing said flanges together.

ll. A sash pulley housing comprising a casing formed from a single sheet of metal having two opposed circular portions connected by an integral relatively narrow strip of metal, said circular portions terminating in apair of abutting flanges lying in the same plane, and a face plate co-extensive with said pair of anges and having its peripheral edges crimped over said flanges.

.EDWIN W. NORTH.

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